Figure 4From: Dissecting microbial community structure and methane-producing pathways of a full-scale anaerobic reactor digesting activated sludge from wastewater treatment by metagenomic sequencing Abundances of major Level 2 subsystems in anaerobic digestion sludge derived from Level 1 subsystem of carbohydrate based on SEED subsystems (The E-value cutoff of 10 −5 and minimum alignment length of 17 aa was used as the annotation parameters). Back to article page